.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    opacity: 0;
    visibility: hidden;
    transition: opacity 30s ease-in-out;
    display: none;
  }
  
  .modal.show {
    opacity: 1;
    visibility: visible;
    display: flex;
    justify-content: center;
    align-items: center;
  }
  
  .modal-content {
    background-color: white;
    padding: 20px;
    border-radius: 5px;
  }